package com.class05.servlet;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet("/servletA")
public class ServletA extends HttpServlet {

    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//        1、获取应用域对象
        ServletContext servletContext = getServletContext();
//        2、给应用域对象添加数据
        servletContext.setAttribute("name", "zhangsan");
//        3、给应用域对象修改数据
        servletContext.setAttribute("name","lisi");

        servletContext.removeAttribute("name");

    }
}

